jvmbytecodesdebug.jrag

JDK1.4编译器后端

                  }
                  break;
        case LOOKUPSWITCH: 
                  {
                    int db = ((index + 4) / 4) * 4; // Align-4, step to defaultbytes
                    int val = fourByteToInt(codes, db);
                    db+=4;
                    res = "defaultbytes:" + val;
                    int npairs = fourByteToInt(codes, db);
                    db+=4;
                    res += ", npairs:" + npairs;
                    for(int i = 0; i < npairs; i++)
                      res += "\n\t" + "match:" + fourByteToInt(codes, db + i * 8) + ", offset:" + fourByteToInt(codes, db + i * 8 + 4);
                  }
                  break;
        case IRETURN: break;
        case LRETURN: break;
        case FRETURN: break;
        case DRETURN: break;
        case ARETURN: break;
        case RETURN: break;
        case GETSTATIC: res = getCharOperand(codes, index+1);break;
        case PUTSTATIC: res = getCharOperand(codes, index+1);break;
        case GETFIELD: res = getCharOperand(codes, index+1);break;
        case PUTFIELD: res = getCharOperand(codes, index+1);break;
        case INVOKEVIRTUAL: res = getCharOperand(codes, index+1);break;
        case INVOKESPECIAL: res = getCharOperand(codes, index+1);break;
        case INVOKESTATIC: res = getCharOperand(codes, index+1);break;
        case INVOKEINTERFACE: res = getCharOperand(codes, index+1)+" "+getByteOperand(codes, index+3);break;
        case NEW: res = getCharOperand(codes, index+1);break;
        case NEWARRAY: res = getByteOperand(codes, index+1);break;
        case ANEWARRAY: res = getCharOperand(codes, index+1);break;
        case ARRAYLENGTH: break;
        case ATHROW: break;
        case CHECKCAST: res = getCharOperand(codes, index+1);;break;
        case INSTANCEOF: res = getCharOperand(codes, index+1);;break;
        case MONITORENTER: break;
        case MONITOREXIT: break;
        case WIDE: res = "XXX";break;
        case MULTIANEWARRAY: res = getCharOperand(codes, index+1)+" "+getByteOperand(codes, index+3);break;
        case IFNULL: res = getCharOperand(codes, index+1);break;
        case IFNONNULL: res = getCharOperand(codes, index+1);break;
        case GOTO_W: res = getIntOperand(codes, index+1);break;
        case JSR_W: res = getIntOperand(codes, index+1);break;
        case BREAKPOINT: break;
        case IMPDEP1: break;
        case IMPDEP2: break;
        default: res = "<UNKNOWN BYTECODE:"+codes[index]+">";
      }
      return res;
    }

    public static int fourByteToInt(byte[] codes, int pos) {
      int b1 = (int)codes[pos + 0];
      int b2 = (int)codes[pos + 1];
      int b3 = (int)codes[pos + 2];
      int b4 = (int)codes[pos + 3];
      int val = b1 << 24 | b2 << 16 | b3 << 8 | b4; 
      return val; 
    }

    public static int stepBytecode(byte[] codes, int index)
    {
      int res = 0;

      switch (codes[index]) {
        case NOP:res++;break;
        case ACONST_NULL:res++;break;
        case LDC2_W:
        case LDC_W:res+=3;break;
        case LDC:res+=2;break;
        case DCONST_0:
        case DCONST_1:
        case LCONST_0:
        case LCONST_1:res++;break;
        case BIPUSH:res+=2;break;
        case SIPUSH:res+=3;break;
        case FCONST_1:
        case FCONST_2:
        case FCONST_0:
        case ICONST_M1:
        case ICONST_0:
        case ICONST_1:
        case ICONST_2:
        case ICONST_3:
        case ICONST_4:
        case ICONST_5:res++;break;
        case FALOAD:
        case BALOAD:
        case CALOAD:
        case SALOAD:
        case IALOAD:res++;break;
        case DALOAD:
        case LALOAD:res++;break;
        case AALOAD:res++;break;
        case FLOAD:
        case FSTORE:
        case ILOAD:
        case ISTORE:res+=2;break;
        case FLOAD_0:
        case FSTORE_0:
        case ILOAD_0:
        case ISTORE_0:res++;break;
        case FLOAD_1:
        case FSTORE_1:
        case ILOAD_1:
        case ISTORE_1:res++;break;
        case FLOAD_2:
        case FSTORE_2:
        case ILOAD_2:
        case ISTORE_2:res++;break;
        case FLOAD_3:
        case FSTORE_3:
        case ILOAD_3:
        case ISTORE_3:res++;break;
        case DLOAD:
        case DSTORE:
        case LLOAD:
        case LSTORE:res+=2;break;
        case DLOAD_0:
        case DSTORE_0:
        case LLOAD_0:
        case LSTORE_0:res++;break;
        case DLOAD_1:
        case DSTORE_1:
        case LLOAD_1:
        case LSTORE_1:res++;break;
        case DLOAD_2:
        case DSTORE_2:
        case LLOAD_2:
        case LSTORE_2:res++;break;
        case DLOAD_3:
        case DSTORE_3:
        case LLOAD_3:
        case LSTORE_3:res++;break;
        case ALOAD:
        case ASTORE:res+=2;break;
        case ALOAD_0:
        case ASTORE_0:res++;break;
        case ALOAD_1:
        case ASTORE_1:res++;break;
        case ALOAD_2:
        case ASTORE_2:res++;break;
        case ALOAD_3:
        case ASTORE_3:res++;break;
        case FASTORE:
        case IASTORE:res++;break;
        case DASTORE:
        case LASTORE:res++;break;
        case AASTORE:res++;break;
        case BASTORE:res++;break;
        case CASTORE:
        case SASTORE:res++;break;
        case POP:res++;break;
        case POP2:res++;break;
        case DUP:res++;break;
        case DUP_X1:res++;break;
        case DUP_X2:res++;break;
        case DUP2:res++;break;
        case DUP2_X1:res++;break;
        case DUP2_X2:res++;break;
        case SWAP:res++;break;
        case IADD:res++;break;
        case FADD:res++;break;
        case DADD:res++;break;
        case LADD:res++;break;
        case ISUB:res++;break;
        case FSUB:res++;break;
        case DSUB:res++;break;
        case LSUB:res++;break;
        case IMUL:res++;break;
        case LMUL:res++;break;
        case DMUL:res++;break;
        case FMUL:res++;break;
        case IDIV:res++;break;
        case LDIV:res++;break;
        case DDIV:res++;break;
        case FDIV:res++;break;
        case IREM:res++;break;
        case LREM:res++;break;
        case DREM:res++;break;
        case FREM:res++;break;
        case INEG:res++;break;
        case LNEG:res++;break;
        case DNEG:res++;break;
        case FNEG:res++;break;
        case ISHL:res++;break;
        case LSHL:res++;break;
        case ISHR:res++;break;
        case LSHR:res++;break;
        case IUSHR:res++;break;
        case LUSHR:res++;break;
        case IAND:res++;break;
        case LAND:res++;break;
        case IOR:res++;break;
        case LOR:res++;break;
        case IXOR:res++;break;
        case LXOR:res++;break;
        case IINC:res+=3;break;
        case I2L:res++;break;
        case I2F:res++;break;
        case I2D:res++;break;
        case L2I:res++;break;
        case L2F:res++;break;
        case L2D:res++;break;
        case F2I:res++;break;
        case F2L:res++;break;
        case F2D:res++;break;
        case D2I:res++;break;
        case D2L:res++;break;
        case D2F:res++;break;
        case I2B:res++;break;
        case I2C:res++;break;
        case I2S:res++;break;
        case LCMP:res++;break;
        case FCMPL:res++;break;
        case FCMPG:res++;break;
        case DCMPL:res++;break;
        case DCMPG:res++;break;
        case IFEQ:res+=3;break;
        case IFNE:res+=3;break;
        case IFLT:res+=3;break;
        case IFGE:res+=3;break;
        case IFGT:res+=3;break;
        case IFLE:res+=3;break;
        case IF_ICMPEQ:res+=3;break;
        case IF_ICMPNE:res+=3;break;
        case IF_ICMPLT:res+=3;break;
        case IF_ICMPGE:res+=3;break;
        case IF_ICMPGT:res+=3;break;
        case IF_ICMPLE:res+=3;break;
        case IF_ACMPEQ:res+=3;break;
        case IF_ACMPNE:res+=3;break;
        case GOTO:res+=3;break;
        case JSR:res+=3;break;
        case RET:res+=2;break;
        case TABLESWITCH:
                 {
                   int db = ((index + 4) / 4) * 4; // Align-4, step to defaultbytes
                   db += 4;
                   int low = fourByteToInt(codes, db);
                   db += 4;
                   int high = fourByteToInt(codes, db);
                   db += 4;
                   db += (high-low+1)*4;
                   res = db;
                 }
                 break;
        case LOOKUPSWITCH:
                 {
                   int db = ((index + 4) / 4) * 4; // Align-4, step to defaultbytes
                   db += 4;
                   int np = fourByteToInt(codes, db);
                   db += 4;
                   db += np * 8;
                   res = db;
                 }
                 break;
        case FRETURN:
        case IRETURN:res++;break;
        case LRETURN:
        case DRETURN:res++;break;
        case ARETURN:res++;break;
        case RETURN:res++;break;
        case GETSTATIC:
        case PUTSTATIC:
        case GETFIELD:
        case PUTFIELD:res+=3;break;
        case INVOKEVIRTUAL:res+=3;break;
        case INVOKESPECIAL:res+=3;break;
        case INVOKESTATIC:res+=3;break;
        case INVOKEINTERFACE:res+=5;break;
        case NEW:res+=3; break;
        case NEWARRAY:res+=2;break;
        case ANEWARRAY:res+=3;break;
        case ARRAYLENGTH:res++;break;
        case ATHROW:res++;break;
        case CHECKCAST:res+=3;break;
        case INSTANCEOF:res+=3;break;
        case MONITORENTER:res++;break;
        case MONITOREXIT:res++;break;
        case WIDE:
                         switch (codes[index+1])
                         {
                           case ILOAD:res+=4;break;
                           case FLOAD:res+=4;break;
                           case ALOAD:res+=4;break;
                           case LLOAD:res+=4;break;
                           case DLOAD:res+=4;break;
                           case ISTORE:res+=4;break;
                           case FSTORE:res+=4;break;
                           case ASTORE:res+=4;break;
                           case LSTORE:res+=4;break;
                           case DSTORE:res+=4;break;
                           case RET:res+=4;break;
                           case IINC:res+=6;break;
                           default:System.err.println("ERROR_INVALID_OPCODE in stepBytecode (wide)");break;
                         }
                         break;
        case MULTIANEWARRAY:res+=4;break;
        case IFNULL:res+=3;break;
        case IFNONNULL:res+=3;break;
        case GOTO_W:res+=5;break;
        case JSR_W:res+=5;break;
                   //        case BREAKPOINT: res++;break;
                   //        case IMPDEP1: res++;break;
                   //        case IMPDEP2: res++;break;
        default:res++;System.err.println("INVALID BYTECODE " + codes[index] + " IN stepBytecode");
      }
      return res;
    }

    public static void printBytecode(PrintStream p, byte[] codes, int index) {
      p.print(toString(codes[index])+" "+getOperands(codes, index));
    } 

    public static void printBytecodes(PrintStream p, byte[] codes) {
      for (int i=0,cnt=1; i<codes.length; i+=stepBytecode(codes,i),cnt++) {
        p.print("\t"+i+"\t"+cnt+"\t");
        printBytecode(p, codes, i);
        p.println();
      }
    }

    public static void appendBytecodes(StringBuffer p, byte[] codes) {
      for(int i = 0, cnt = 1; i < codes.length; i += stepBytecode(codes,i), cnt++) {
        p.append(" " + i + " " + cnt + "\t");
        p.append(toString(codes[i])+" "+getOperands(codes, i));
        p.append("\n");
      }
    }
  }
}